Abstract: This paper proposes new structures for realizing tunable 2D fan and elliptical filters with different spectral characteristics using McClellan transformation. The 1D prototype is a variable ...

A large outbreak of the eastern spruce budworm is defoliating trees and stressing or killing them, which can then help fuel ...

Aspen trees tend to have rough bark that ranges in color ... This species is often associated with Douglas fir timber, as it is a pioneer tree for fires and logging, taking root more quickly ...

The eastern spruce budworm is a native insect that munches on balsam fir, leaving some 1,100 square miles of trees defoliated ...